Do a compression test, water does not like to compress in the cylinder, you could have blown your rings out, cold water could have bent a hot valve. I assume you cleaned or replaced the air filter? Also there are some very small holes in the carb that could still be clogged with sediment, you need to check and clean EVERY area of the carb. Lastly, check for air leaks.
Yours truly, sincerelly, love always, Josh aka The DirtDemon.